The head of memory chip maker Micron, long known for taking risks in stunt piloting, died Friday when a small experimental plane he was piloting steeply banked, stalled and crashed near an Idaho runway. Steve Appleton, who survived a similar crash eight years ago and had a reputation as a hard-driving daredevil, was the only person aboard the plane when witnesses said it crashed shortly after its second take-off attempt in Boise, according to safety investigators.